shelbygreen022 shelbygreen022

15-06-2018
Mathematics

contestada

sovle by completeing the square round to the nearest hunderth if nessasary x^2+2x=8
a. x= 2, 4
b. x= -2, 4
c. x= 2, -4
d. x= -2, -4

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ogbonnanaomi247 ogbonnanaomi247

16-06-2018

The answer is C
x² + 2x = 8 2/2=1; 1²=1, then you add to both sides of the equation

x²+ 2x+ 1 = 8 + 1 factor (x+1)(x+1)

(x+1)² = 9 square root both sides

√(x+1)² = √9

x+1= 3 or x+1 = -3
x= 3- 1 x= -3-1
x= 2 x= -4

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